I used the car first thing, with no issues, then parked it in the sun for 4 hours. When I next went to use it there was a strange "acidic" smell in the cabin (not battery acid). I opened my window while I went to pick up my wife. Before putting the car away in the garage I checked the boot for any "shopping" that may have dropped out the bags and "matured". Nothing. The boot was dry, as was the rear wheel well. I checked the carpets, in the car, and they were bone dry (surprising after Saturday's rain). I sprayed the interior fabric with Febreze, and a quick squirt of air freshener wafted about completed the deal. I'll see what it is like tomorrow. Strange though.